Citation: Thompson, R. M.; Downs, R. T. (2004). Model pyroxenes II: Structural variation as a function of tetrahedral rotation model low clinospodumene at P = 8.835 GPa after Arlt and Angel (2000) with O3A-O3A-O3A angle = 206.4, O3B-O3B-O3B angle = 143.5, and model oxygen radius = 1.254. American Mineralogist, 89, pp. 614-628.